p 3 h 4 o 1 t 1 o 1 n 1
6 letters · 11 points in Scrabble
Meaning
noun a quantum of electromagnetic radiation; an elementary particle that is its own antiparticle
originFrom photo- + -on. Coined by American physicist Leonard Troland in 1916 as a unit of light hitting the retina, and later popularized in a more modern sense by Gilbert N. Lewis, with the term gaining acceptance in the physics community by the late 1920s.
Etymology from Wiktionary, CC BY-SA 3.0